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      Leukocyte Adhesion after Oxidant Challenge in the Hamster Cheek Pouch Microcirculation

      a , a , b

      Journal of Vascular Research

      S. Karger AG

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          Abstract

          Oral administration of S-5682 (Daflon 500 mg, 90% diosmin, 10% hesperidin) inhibits oxidant-induced increase in macromolecular permeability in the postcapillary venules of the hamster cheek pouch microcirculation. In this study, the effect of S-5682 on leukocyte-endothelium interaction was evaluated using the same experimental model. Hamsters kept on a standard diet were divided into 5 groups (n = 6) and treated orally, twice a day, with placebo (10% lactose solution), S-5682, 5, 20 or 80 mg/kg/day (suspended in 10% lactose solution) or α-tocopherol, 1 mg/kg/day, for 10 days prior to the oxidant challenge with tert-butylhydroperoxide (TBOOH). Topical application of TBOOH (10<sup>–4</sup>  M for 5 min) to hamsters given acridine orange prior to TBOOH resulted in increases in the number of rolling and sticking (no movement for at least 30 s) leukocytes in postcapillary venules. No changes in the number of rolling leukocytes could be observed in the treated groups compared with the placebo group (p > 0.05). On the contrary, leukocyte adhesion was inhibited in groups treated with S-5682 (5, 20 and 80 mg/kg/day) or α-tocopherol: placebo 105 ± 3/6 mm<sup>2</sup> (mean ± SEM); S-5682, 5 mg/kg/day 68 ± 3/6 mm<sup>2</sup> (p < 0.01), 20 mg/kg/day 55 ± 3/6 mm<sup>2</sup> (p < 0.001) and 80 mg/ kg/day 39 ± 2/6 mm<sup>2</sup> (p < 0.001) and α-tocopherol 36 ± 1/6 mm<sup>2</sup> (p < 0.001). The inhibition of oxidant-induced leukocyte adhesion by S-5682 was similar to that seen for ischemia-reperfusion and the higher dose of S-5682 was as effective as α-tocopherol in inhibiting it.

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          Author and article information

          Journal
          JVR
          J Vasc Res
          10.1159/issn.1018-1172
          Journal of Vascular Research
          S. Karger AG
          978-3-8055-6933-0
          978-3-318-00479-3
          1018-1172
          1423-0135
          1999
          August 1999
          27 August 1999
          : 36
          : Suppl 1
          : 11-14
          Affiliations
          aLaboratório de Pesquisas em Microcirculação, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil, and bInstitut de Recherches Internationales Servier, Courbevoie, France
          Article
          54069 J Vasc Res 1999;36(suppl 1):11–14
          10.1159/000054069
          10474046
          © 1999 S. Karger AG, Basel

          Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

          Page count
          Tables: 1, References: 24, Pages: 4
          Categories
          Paper

          General medicine, Neurology, Cardiovascular Medicine, Internal medicine, Nephrology

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